Manual:$wgExternalStores

Content handlers and storage: $wgExternalStores
List of enabled ExternalStore protocols.
Introduced in version:	1.4.5
Removed in version:	Still in use
Allowed values:	Unspecified
Default value:	`[]` (1.23+) `false` (1.4.5-1.22)
Other settings: Alphabetical \| By function

Details

List of enabled ExternalStore protocols.

$wgExternalStores = [ "DB" ];

Caution:

Access to database might lead to code execution.